1 /* 2 * Sysfs interface for the universal power supply monitor class 3 * 4 * Copyright © 2007 David Woodhouse <dwmw2@infradead.org> 5 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> 6 * Copyright © 2004 Szabolcs Gyurko 7 * Copyright © 2003 Ian Molton <spyro@f2s.com> 8 * 9 * Modified: 2004, Oct Szabolcs Gyurko 10 * 11 * You may use this code as per GPL version 2 12 */ 13 14 #include <linux/ctype.h> 15 #include <linux/device.h> 16 #include <linux/power_supply.h> 17 #include <linux/slab.h> 18 #include <linux/stat.h> 19 20 #include "power_supply.h" 21 22 /* 23 * This is because the name "current" breaks the device attr macro. 24 * The "current" word resolves to "(get_current())" so instead of 25 * "current" "(get_current())" appears in the sysfs. 26 * 27 * The source of this definition is the device.h which calls __ATTR 28 * macro in sysfs.h which calls the __stringify macro. 29 * 30 * Only modification that the name is not tried to be resolved 31 * (as a macro let's say). 32 */ 33 34 #define POWER_SUPPLY_ATTR(_name) \ 35 { \ 36 .attr = { .name = #_name }, \ 37 .show = power_supply_show_property, \ 38 .store = power_supply_store_property, \ 39 } 40 41 static struct device_attribute power_supply_attrs[]; 42 43 static const char * const power_supply_type_text[] = { 44 "Unknown", "Battery", "UPS", "Mains", "USB", 45 "USB_DCP", "USB_CDP", "USB_ACA", "USB_C", 46 "USB_PD", "USB_PD_DRP", "BrickID" 47 }; 48 49 static const char * const power_supply_status_text[] = { 50 "Unknown", "Charging", "Discharging", "Not charging", "Full" 51 }; 52 53 static const char * const power_supply_charge_type_text[] = { 54 "Unknown", "N/A", "Trickle", "Fast" 55 }; 56 57 static const char * const power_supply_health_text[] = { 58 "Unknown", "Good", "Overheat", "Dead", "Over voltage", 59 "Unspecified failure", "Cold", "Watchdog timer expire", 60 "Safety timer expire" 61 }; 62 63 static const char * const power_supply_technology_text[] = { 64 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", 65 "LiMn" 66 }; 67 68 static const char * const power_supply_capacity_level_text[] = { 69 "Unknown", "Critical", "Low", "Normal", "High", "Full" 70 }; 71 72 static const char * const power_supply_scope_text[] = { 73 "Unknown", "System", "Device" 74 }; 75 76 static ssize_t power_supply_show_property(struct device *dev, 77 struct device_attribute *attr, 78 char *buf) { 79 ssize_t ret = 0; 80 struct power_supply *psy = dev_get_drvdata(dev); 81 const ptrdiff_t off = attr - power_supply_attrs; 82 union power_supply_propval value; 83 84 if (off == POWER_SUPPLY_PROP_TYPE) { 85 value.intval = psy->desc->type; 86 } else { 87 ret = power_supply_get_property(psy, off, &value); 88 89 if (ret < 0) { 90 if (ret == -ENODATA) 91 dev_dbg(dev, "driver has no data for `%s' property\n", 92 attr->attr.name); 93 else if (ret != -ENODEV && ret != -EAGAIN) 94 dev_err(dev, "driver failed to report `%s' property: %zd\n", 95 attr->attr.name, ret); 96 return ret; 97 } 98 } 99 100 if (off == POWER_SUPPLY_PROP_STATUS) 101 return sprintf(buf, "%s\n", 102 power_supply_status_text[value.intval]); 103 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) 104 return sprintf(buf, "%s\n", 105 power_supply_charge_type_text[value.intval]); 106 else if (off == POWER_SUPPLY_PROP_HEALTH) 107 return sprintf(buf, "%s\n", 108 power_supply_health_text[value.intval]); 109 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) 110 return sprintf(buf, "%s\n", 111 power_supply_technology_text[value.intval]); 112 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) 113 return sprintf(buf, "%s\n", 114 power_supply_capacity_level_text[value.intval]); 115 else if (off == POWER_SUPPLY_PROP_TYPE) 116 return sprintf(buf, "%s\n", 117 power_supply_type_text[value.intval]); 118 else if (off == POWER_SUPPLY_PROP_SCOPE) 119 return sprintf(buf, "%s\n", 120 power_supply_scope_text[value.intval]); 121 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) 122 return sprintf(buf, "%s\n", value.strval); 123 124 return sprintf(buf, "%d\n", value.intval); 125 } 126 127 static ssize_t power_supply_store_property(struct device *dev, 128 struct device_attribute *attr, 129 const char *buf, size_t count) { 130 ssize_t ret; 131 struct power_supply *psy = dev_get_drvdata(dev); 132 const ptrdiff_t off = attr - power_supply_attrs; 133 union power_supply_propval value; 134 135 /* maybe it is a enum property? */ 136 switch (off) { 137 case POWER_SUPPLY_PROP_STATUS: 138 ret = sysfs_match_string(power_supply_status_text, buf); 139 break; 140 case POWER_SUPPLY_PROP_CHARGE_TYPE: 141 ret = sysfs_match_string(power_supply_charge_type_text, buf); 142 break; 143 case POWER_SUPPLY_PROP_HEALTH: 144 ret = sysfs_match_string(power_supply_health_text, buf); 145 break; 146 case POWER_SUPPLY_PROP_TECHNOLOGY: 147 ret = sysfs_match_string(power_supply_technology_text, buf); 148 break; 149 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 150 ret = sysfs_match_string(power_supply_capacity_level_text, buf); 151 break; 152 case POWER_SUPPLY_PROP_SCOPE: 153 ret = sysfs_match_string(power_supply_scope_text, buf); 154 break; 155 default: 156 ret = -EINVAL; 157 } 158 159 /* 160 * If no match was found, then check to see if it is an integer. 161 * Integer values are valid for enums in addition to the text value. 162 */ 163 if (ret < 0) { 164 long long_val; 165 166 ret = kstrtol(buf, 10, &long_val); 167 if (ret < 0) 168 return ret; 169 170 ret = long_val; 171 } 172 173 value.intval = ret; 174 175 ret = power_supply_set_property(psy, off, &value); 176 if (ret < 0) 177 return ret; 178 179 return count; 180 } 181 182 /* Must be in the same order as POWER_SUPPLY_PROP_* */ 183 static struct device_attribute power_supply_attrs[] = { 184 /* Properties of type `int' */ 185 POWER_SUPPLY_ATTR(status), 186 POWER_SUPPLY_ATTR(charge_type), 187 POWER_SUPPLY_ATTR(health), 188 POWER_SUPPLY_ATTR(present), 189 POWER_SUPPLY_ATTR(online), 190 POWER_SUPPLY_ATTR(authentic), 191 POWER_SUPPLY_ATTR(technology), 192 POWER_SUPPLY_ATTR(cycle_count), 193 POWER_SUPPLY_ATTR(voltage_max), 194 POWER_SUPPLY_ATTR(voltage_min), 195 POWER_SUPPLY_ATTR(voltage_max_design), 196 POWER_SUPPLY_ATTR(voltage_min_design), 197 POWER_SUPPLY_ATTR(voltage_now), 198 POWER_SUPPLY_ATTR(voltage_avg), 199 POWER_SUPPLY_ATTR(voltage_ocv), 200 POWER_SUPPLY_ATTR(voltage_boot), 201 POWER_SUPPLY_ATTR(current_max), 202 POWER_SUPPLY_ATTR(current_now), 203 POWER_SUPPLY_ATTR(current_avg), 204 POWER_SUPPLY_ATTR(current_boot), 205 POWER_SUPPLY_ATTR(power_now), 206 POWER_SUPPLY_ATTR(power_avg), 207 POWER_SUPPLY_ATTR(charge_full_design), 208 POWER_SUPPLY_ATTR(charge_empty_design), 209 POWER_SUPPLY_ATTR(charge_full), 210 POWER_SUPPLY_ATTR(charge_empty), 211 POWER_SUPPLY_ATTR(charge_now), 212 POWER_SUPPLY_ATTR(charge_avg), 213 POWER_SUPPLY_ATTR(charge_counter), 214 POWER_SUPPLY_ATTR(constant_charge_current), 215 POWER_SUPPLY_ATTR(constant_charge_current_max), 216 POWER_SUPPLY_ATTR(constant_charge_voltage), 217 POWER_SUPPLY_ATTR(constant_charge_voltage_max), 218 POWER_SUPPLY_ATTR(charge_control_limit), 219 POWER_SUPPLY_ATTR(charge_control_limit_max), 220 POWER_SUPPLY_ATTR(input_current_limit), 221 POWER_SUPPLY_ATTR(energy_full_design), 222 POWER_SUPPLY_ATTR(energy_empty_design), 223 POWER_SUPPLY_ATTR(energy_full), 224 POWER_SUPPLY_ATTR(energy_empty), 225 POWER_SUPPLY_ATTR(energy_now), 226 POWER_SUPPLY_ATTR(energy_avg), 227 POWER_SUPPLY_ATTR(capacity), 228 POWER_SUPPLY_ATTR(capacity_alert_min), 229 POWER_SUPPLY_ATTR(capacity_alert_max), 230 POWER_SUPPLY_ATTR(capacity_level), 231 POWER_SUPPLY_ATTR(temp), 232 POWER_SUPPLY_ATTR(temp_max), 233 POWER_SUPPLY_ATTR(temp_min), 234 POWER_SUPPLY_ATTR(temp_alert_min), 235 POWER_SUPPLY_ATTR(temp_alert_max), 236 POWER_SUPPLY_ATTR(temp_ambient), 237 POWER_SUPPLY_ATTR(temp_ambient_alert_min), 238 POWER_SUPPLY_ATTR(temp_ambient_alert_max), 239 POWER_SUPPLY_ATTR(time_to_empty_now), 240 POWER_SUPPLY_ATTR(time_to_empty_avg), 241 POWER_SUPPLY_ATTR(time_to_full_now), 242 POWER_SUPPLY_ATTR(time_to_full_avg), 243 POWER_SUPPLY_ATTR(type), 244 POWER_SUPPLY_ATTR(scope), 245 POWER_SUPPLY_ATTR(precharge_current), 246 POWER_SUPPLY_ATTR(charge_term_current), 247 POWER_SUPPLY_ATTR(calibrate), 248 /* Properties of type `const char *' */ 249 POWER_SUPPLY_ATTR(model_name), 250 POWER_SUPPLY_ATTR(manufacturer), 251 POWER_SUPPLY_ATTR(serial_number), 252 }; 253 254 static struct attribute * 255 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 256 257 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 258 struct attribute *attr, 259 int attrno) 260 { 261 struct device *dev = container_of(kobj, struct device, kobj); 262 struct power_supply *psy = dev_get_drvdata(dev); 263 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 264 int i; 265 266 if (attrno == POWER_SUPPLY_PROP_TYPE) 267 return mode; 268 269 for (i = 0; i < psy->desc->num_properties; i++) { 270 int property = psy->desc->properties[i]; 271 272 if (property == attrno) { 273 if (psy->desc->property_is_writeable && 274 psy->desc->property_is_writeable(psy, property) > 0) 275 mode |= S_IWUSR; 276 277 return mode; 278 } 279 } 280 281 return 0; 282 } 283 284 static struct attribute_group power_supply_attr_group = { 285 .attrs = __power_supply_attrs, 286 .is_visible = power_supply_attr_is_visible, 287 }; 288 289 static const struct attribute_group *power_supply_attr_groups[] = { 290 &power_supply_attr_group, 291 NULL, 292 }; 293 294 void power_supply_init_attrs(struct device_type *dev_type) 295 { 296 int i; 297 298 dev_type->groups = power_supply_attr_groups; 299 300 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 301 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 302 } 303 304 static char *kstruprdup(const char *str, gfp_t gfp) 305 { 306 char *ret, *ustr; 307 308 ustr = ret = kmalloc(strlen(str) + 1, gfp); 309 310 if (!ret) 311 return NULL; 312 313 while (*str) 314 *ustr++ = toupper(*str++); 315 316 *ustr = 0; 317 318 return ret; 319 } 320 321 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 322 { 323 struct power_supply *psy = dev_get_drvdata(dev); 324 int ret = 0, j; 325 char *prop_buf; 326 char *attrname; 327 328 dev_dbg(dev, "uevent\n"); 329 330 if (!psy || !psy->desc) { 331 dev_dbg(dev, "No power supply yet\n"); 332 return ret; 333 } 334 335 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name); 336 337 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 338 if (ret) 339 return ret; 340 341 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 342 if (!prop_buf) 343 return -ENOMEM; 344 345 for (j = 0; j < psy->desc->num_properties; j++) { 346 struct device_attribute *attr; 347 char *line; 348 349 attr = &power_supply_attrs[psy->desc->properties[j]]; 350 351 ret = power_supply_show_property(dev, attr, prop_buf); 352 if (ret == -ENODEV || ret == -ENODATA) { 353 /* When a battery is absent, we expect -ENODEV. Don't abort; 354 send the uevent with at least the the PRESENT=0 property */ 355 ret = 0; 356 continue; 357 } 358 359 if (ret < 0) 360 goto out; 361 362 line = strchr(prop_buf, '\n'); 363 if (line) 364 *line = 0; 365 366 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 367 if (!attrname) { 368 ret = -ENOMEM; 369 goto out; 370 } 371 372 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); 373 374 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 375 kfree(attrname); 376 if (ret) 377 goto out; 378 } 379 380 out: 381 free_page((unsigned long)prop_buf); 382 383 return ret; 384 } 385